GPL FTP invalid MODE

Query · suricata

flow:to_server,established;
content:"MODE"; nocase;
pcre:"/^MODE\s+[^ABSC]{1}/msi";
Raw source GPL FTP invalid MODE · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert ftp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"GPL FTP invalid MODE";
    flow:to_server,established;
    content:"MODE"; nocase;
    pcre:"/^MODE\s+[^ABSC]{1}/msi";
    classtype:protocol-command-decode;
    sid:2101623; rev:7;
    metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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